EP4299313A1 - Molding film and molded body in which same is used - Google Patents

Molding film and molded body in which same is used Download PDF

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Publication number
EP4299313A1
EP4299313A1 EP22759619.4A EP22759619A EP4299313A1 EP 4299313 A1 EP4299313 A1 EP 4299313A1 EP 22759619 A EP22759619 A EP 22759619A EP 4299313 A1 EP4299313 A1 EP 4299313A1
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EP
European Patent Office
Prior art keywords
layer
film
resin
molding
polyester film
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
EP22759619.4A
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German (de)
English (en)
French (fr)
Inventor
Yuji Kawata
Ryuichi Wakahara
Kenta Morishita
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Toray Industries Inc
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Toray Industries Inc
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Publication of EP4299313A1 publication Critical patent/EP4299313A1/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/36—Layered products comprising a layer of synthetic resin comprising polyesters
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B25/00—Layered products comprising a layer of natural or synthetic rubber
    • B32B25/04—Layered products comprising a layer of natural or synthetic rubber comprising rubber as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B25/08—Layered products comprising a layer of natural or synthetic rubber comprising rubber as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B25/00—Layered products comprising a layer of natural or synthetic rubber
    • B32B25/16—Layered products comprising a layer of natural or synthetic rubber comprising polydienes homopolymers or poly-halodienes homopolymers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B27/08—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/30—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers
    • B32B27/302—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers comprising aromatic vinyl (co)polymers, e.g. styrenic (co)polymers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/30—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers
    • B32B27/308—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers comprising acrylic (co)polymers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/36—Layered products comprising a layer of synthetic resin comprising polyesters
    • B32B27/365—Layered products comprising a layer of synthetic resin comprising polyesters comprising polycarbonates
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/02—Physical, chemical or physicochemical properties
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/02—Physical, chemical or physicochemical properties
    • B32B7/023—Optical properties
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/03—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers with respect to the orientation of features
    • B32B7/035—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers with respect to the orientation of features using arrangements of stretched films, e.g. of mono-axially stretched films arranged alternately
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/04—Interconnection of layers
    • B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2250/00—Layers arrangement
    • B32B2250/05—5 or more layers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2250/00—Layers arrangement
    • B32B2250/24—All layers being polymeric
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2270/00—Resin or rubber layer containing a blend of at least two different polymers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/40—Properties of the layers or laminate having particular optical properties
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/40—Properties of the layers or laminate having particular optical properties
    • B32B2307/402—Coloured
    • B32B2307/4026—Coloured within the layer by addition of a colorant, e.g. pigments, dyes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/40—Properties of the layers or laminate having particular optical properties
    • B32B2307/412—Transparent
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/40—Properties of the layers or laminate having particular optical properties
    • B32B2307/416—Reflective
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/50—Properties of the layers or laminate having particular mechanical properties
    • B32B2307/514—Oriented
    • B32B2307/516—Oriented mono-axially
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/50—Properties of the layers or laminate having particular mechanical properties
    • B32B2307/514—Oriented
    • B32B2307/518—Oriented bi-axially
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/50—Properties of the layers or laminate having particular mechanical properties
    • B32B2307/54—Yield strength; Tensile strength
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/70—Other properties
    • B32B2307/704—Crystalline
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/70—Other properties
    • B32B2307/732—Dimensional properties
    • B32B2307/737—Dimensions, e.g. volume or area
    • B32B2307/7375—Linear, e.g. length, distance or width
    • B32B2307/7376—Thickness
    • B—PERFORMING OPERATIONS; TRANSPORTING
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    • B32B2355/00—Specific polymers obtained by polymerisation reactions only involving carbon-to-carbon unsaturated bonds, not provided for in a single one of index codes B32B2323/00 - B32B2333/00
    • B32B2355/02—ABS polymers, i.e. acrylonitrile-butadiene-styrene polymers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2451/00—Decorative or ornamental articles

Definitions

  • the present invention relates to a molding film and a molded body using the same.
  • a method for performing metallic tone decoration using a film a method is known in which a design layer containing aluminum, indium, chromium, or the like as a main component is formed on a film using a vapor deposition method such as a vacuum vapor deposition method, a sputtering method, or an ion blating method, and then the design layer is transferred to an object member (Patent Document 1).
  • a vapor deposition method such as a vacuum vapor deposition method, a sputtering method, or an ion blating method
  • Patent Document 2 a method in which a metallic tone appearance is realized by forming an optical interference multilayer film that highly reflects visible light and highly transmits near infrared light on an object member by utilizing an interference phenomenon of light generated by alternately laminating two or more kinds of materials having different refractive indexes with a layer thickness at a wavelength level of light.
  • Patent Document 3 a method for improving the moldability of a molding film using a light interference multilayer film, a method of laminating a polycarbonate resin or an acrylic resin on at least one surface of the light interference multilayer film, and a method of controlling the storage elastic modulus and stretching stress of the entire moldable film are known (Patent Document 3).
  • An object of the present invention is to ameliorate the problems with the conventional technique and to provide a molding film having metallic tone gloss and particularly excellent moldability during molding processing.
  • the molding film of the present invention is a molding film having a resin layer (X layer) on at least one surface of a polyester film, wherein the polyester film has a composition in which a layer (A layer) containing a thermoplastic resin A as a main component and a layer (B layer) containing a thermoplastic resin B different from the thermoplastic resin A as a main component are alternately laminated in a thickness direction in a total of 51 or more layers.
  • a preferred embodiment of the molding film of the present invention is a molding film in which the thickness Tx [um] of the X layer, the thickness Tp [um] of the polyester film, the 50% tensile stress Fx [MPa] of the X layer at 150°C, and the 50% tensile stress Fp [MPa] of the polyester film at 150°C satisfy the following formulas (1) and (2) .
  • a molding film having excellent moldability during molding processing can be provided. Further, according to a preferred aspect of the present invention, it is possible to provide a molding film that exhibits a metallic tone while having transparency to a sensor having an infrared wavelength, and that can achieve both improvement in molding followability and suppression of coloring at the time of molding.
  • a molding film of the present invention is a molding film having a resin layer (X layer) on at least one surface of a polyester film, wherein the polyester film has a composition in which a layer (A layer) containing a thermoplastic resin A as a main component and a layer (B layer) containing a thermoplastic resin B different from the thermoplastic resin A as a main component are alternately laminated in a thickness direction in a total of 51 or more layers. Adopting the above aspect provides the molding film with a metallic gloss tone and excellence in moldability during molding processing.
  • the polyester film has a configuration in which a layer (A layer) containing a thermoplastic resin A as a main component and a layer (B layer) containing a thermoplastic resin B different from the thermoplastic resin A as a main component are alternately laminated in a thickness direction in a total of 51 or more layers.
  • the structure is more preferably a structure in which a total of 250 or more layers of A layers and B layers are alternately laminated in the thickness direction, further more preferably a structure in which 400 or more layers are laminated, and particularly preferably a structure in which 800 or more layers are laminated.
  • the upper limit of the number of layers is not particularly limited, but is preferably 2000 layers or less from the viewpoint of productivity and cost. When the number of layers to be laminated is less than 51, visible light cannot be uniformly reflected, and a film with high chroma may be obtained.
  • the polyester film refers to a film containing a polyester resin in an amount of more than 50 mass% and 100 mass% or less based on 100 mass% of all components constituting the film.
  • the polyester resin refers to a resin having a molecular structure in which a dicarboxylic acid unit and a diol unit are connected by an ester bond.
  • the polyester film in the present invention is preferably a biaxially oriented polyester film from the viewpoint of film strength, heat resistance, and versatility.
  • the biaxially oriented polyester film refers to a polyester film having molecular orientation in two orthogonal directions, and is usually obtained by stretching an unstretched polyester sheet in two orthogonal directions.
  • the polyester film in the molding film of the present invention preferably contains three or more thick film layers having a thickness of 1 um or more and 20 um or less, and the thick film layers are the outermost layers on both sides, from the viewpoint of reducing loss of metallic tone gloss during molding.
  • the thickness of the thick film layer is more preferably 5 um or more and 10 um or less.
  • the thick film layer with a thickness of 1 um or more can reduce occurrence of washout due to resin shearing and distortion of the laminated structure when a resin is injected from the polyester film side in injection molding processing such as insert molding. This reduces loss of gloss in the vicinity of the resin injection portion and occurrence of ring-shaped defects.
  • the thick film layer is the A layer having a high resin strength from the viewpoint of being able to reduce the shearing of the resin at the time of injection molding.
  • the number of layers with a layer-pair thickness of 100 nm or more and less than 200 nm is preferably larger than the number of layers with a layer-pair thickness of 200 nm or more and less than 250 nm from the viewpoint of making the reflectance in the wavelength band of 400 to 700 nm more uniform.
  • the "layer-pair thickness” refers to a thickness obtained by adding the layer thicknesses of the adjacent A layer and B layer.
  • the layer-pair thickness must be obtained by adding the layer thickness of the mth A layer counted from one film surface only for the A layer and the layer thickness of the mth B layer counted from the same surface only for the adjacent B layer.
  • m represents an integer.
  • the A1 layer and the B1 layer are the first layer pair
  • the A2 layer and the B2 layer are the second layer pair
  • the A3 layer and the B3 are the third layer pair.
  • the reflectance decreases toward the lower wavelength side in the reflection bandwidth of the wavelength band of 400 nm to 700 nm, so that a reddish appearance may be obtained. This occurs because the density of the layer pair that causes reflection on the low wavelength side is reduced. Therefore, as a layer-pair thickness order of the layers constituting the polyester film, it is preferable that the layer-pair thickness does not monotonically increase or decrease in an arithmetic progression but increases or decreases in a geometric progression while satisfying the above conditions.
  • the number of layers with a layer-pair thickness of 100 nm or more and less than 200 nm is 1.05 times or more and 2.50 times or less the number of layers with a layer-pair thickness of 200 nm or more and less than 250 nm.
  • the thermoplastic resin A and the thermoplastic resin B in the polyester film are preferably polyester resins from the viewpoint of strength, heat resistance, transparency, and versatility.
  • the polyester resin a polyester obtained by polymerization from a monomer composed of an aromatic dicarboxylic acid or an aliphatic dicarboxylic acid and a diol as main components is preferable.
  • examples of the aromatic dicarboxylic acid include terephthalic acid, isophthalic acid, phthalic acid, 1,4-naphthalene dicarboxylic acid, 1,5-naphthalene dicarboxylic acid, 2,6-naphthalene dicarboxylic acid, 4,4'-diphenyl dicarboxylic acid, 4,4'-diphenyl ether dicarboxylic acid, and 4,4'-diphenyl sulfone dicarboxylic acid.
  • aliphatic dicarboxylic acid examples include adipic acid, suberic acid, sebacic acid, dimer acid, dodecanedioic acid, cyclohexanedicarboxylic acid, and ester derivatives thereof.
  • terephthalic acid and 2,6-naphthalenedicarboxylic acid with a high refractive index are preferable.
  • These acid components may be used alone or in combination of two or more, and may be partially copolymerized with an oxyacid such as hydroxybenzoic acid.
  • diol component examples include ethylene glycol, 1,2-propanediol, 1,3-propanediol, neopentyl glycol, 1,3-butanediol, 1,4-butanediol, 1,5-pentanediol, 1,6-hexanediol, 1,2-cyclohexanedimethanol, 1,3-cyclohexanedimethanol, 1,4-hexanedimethanol, diethylene glycol, triethylene glycol, polyalkylene glycol, 2,2-bis(4-hydroxyethoxyphenyl)propane, isosorbate, and spiroglycol.
  • ethylene glycol is preferably used.
  • diol components may be used alone or in combination of two or more.
  • polyester resins polyethylene terephthalate and a copolymer thereof, polyethylene naphthalate and a copolymer thereof, polybutylene terephthalate and a copolymer thereof, polybutylene naphthalate and a copolymer thereof, polyhexamethylene terephthalate and a copolymer thereof, polyhexamethylene naphthalate and a copolymer thereof, and the like are preferably used from the viewpoint of increasing the in-plane average refractive index of the A layer and easily setting the difference from the in-plane average refractive index of the B layer to 0.005 or more, and preferably 0.040 or more.
  • the combination of the thermoplastic resin A and the thermoplastic resin B is preferably a combination in which the basic skeletons of both thermoplastic resins are common.
  • the "basic skeleton" referred to in the present invention refers to a repeating unit that constitutes a resin and is contained in the largest amount, and for example, in the case of polyethylene terephthalate, ethylene terephthalate is the basic skeleton.
  • thermoplastic resin is polyethylene terephthalate
  • the other thermoplastic resin is a polymer (copolymer) composed of an ethylene terephthalate unit and a cyclohexane 1,4-dimethylene terephthalate unit
  • the ethylene terephthalate unit is contained in the largest amount.
  • thermoplastic resin A it is preferable to use a crystalline resin from the viewpoint of enhancing the press imprint resistance (dent resistance) and the stiffness of the polyester film itself.
  • thermoplastic resin A polyethylene terephthalate or polyethylene naphthalate is preferably used.
  • thermoplastic resin B is preferably a non-crystalline resin from the viewpoint of suppressing an increase in refractive index to form a non-crystalline film.
  • thermoplastic resin B it is preferable to use polyethylene terephthalate or a copolymer of polyethylene naphthalate containing isophthalic acid, naphthalenedicarboxylic acid, diphenyl acid, or cyclohexanedicarboxylic acid, or containing spiroglycol, cyclohexanedimethanol, bisphenoxyethanolfluorene, or bisphenol A as a constituent unit.
  • the molding film of the present invention is excellent in moldability during molding processing, and it is important to have a resin layer (X layer) on at least one side of the polyester film from the viewpoint of protecting the polyester film when injection molding processing is performed.
  • the type of the resin of the X layer is not particularly limited, but it is preferably a thermoplastic resin from the viewpoint of moldability. A more preferred embodiment of the resin of the X layer will be described later.
  • a thickness Tx [um] of the X layer, a thickness Tp [um] of the polyester film, a 50% tensile stress Fx [MPa] of the X layer at 150°C, and a 50% tensile stress Fp [MPa] of the polyester film at 150°C satisfy the following formulas (1) and (2).
  • the material having a low glass transition temperature includes a method of adding the material to at least one of A layer and B layer constituting the polyester film.
  • the glass transition temperature can be increased by increasing the volume average molecular weight of the polycarbonate resin, introducing a substituent into the bisphenol skeleton of the polycarbonate resin, adopting a transesterification method instead of a general phosgene method as a method of polymerizing the polycarbonate resin, and the like.
  • the value of Tx ⁇ Fp indicated in the formula (1) is more preferably 7500 or less, and further preferably 4000 or less.
  • the lower limit of the value of Tx ⁇ Fp is not particularly limited, but is often 50 in consideration of the thickness of the polyester film having a metallic gloss tone.
  • the preferable range of the values of Tx ⁇ Fp of all the X layers is as described above.
  • the value of Tp ⁇ Fx indicated in the formula (2) is more preferably 350 or more, and further preferably 500 or more.
  • the upper limit of the value of Tx ⁇ Fp is not particularly limited, but is often 20,000 when considering the tensile stress of a general resin at 150°C.
  • the preferable range of the values of Tp ⁇ Fx of all the X layers is as described above.
  • Tp ⁇ Fx ⁇ Tx ⁇ Fp it is more preferable that the relationship of Tp ⁇ Fx ⁇ Tx ⁇ Fp is satisfied and also both the formulas (1) and (2) are satisfied.
  • Tp ⁇ Fx and Tx ⁇ Fp have the above relationship, local stretching of the polyester film during molding processing is less likely to occur, and coloring of the molded body is easily suppressed.
  • the thickness of each layer can be measured by measuring a cross section when the molding film is cut in parallel with the thickness direction from an image taken with a scanning electron microscope.
  • the 50% tensile stress of each layer at 150°C can be measured by performing a tensile test at 150°C with the longitudinal direction as the measurement direction (details will be described later). In a case where the longitudinal direction cannot be specified, a tensile test is performed for a direction arbitrarily set and each direction rotated from the direction by 15° to 175°, and if the formulas (1) and (2) are satisfied when a value in a direction in which the 50% tensile stress is maximum or a direction orthogonal thereto is used, it can be considered that the formulas (1) and (2) are satisfied.
  • the glass transition temperature Tg (X) of the X layer and the glass transition temperature Tg (P) of the polyester film preferably satisfy the following formula (3).
  • the method for measuring the glass transition temperatures of the X layer and the polyester is as described later. Tg X ⁇ Tg P + 70 .
  • the polyester film does not become excessively soft and a stable layer composition can be maintained when the temperature of the molding film is raised to a temperature at which the X layer is deformed (molded) during molding processing, so that unevenness in metallic tone appearance can be reduced.
  • the resin of the X layer constituting the molding film of the present invention will be described in detail later, but in the case of a non-crystalline resin, the glass transition temperature Tg (X) of the X layer and the glass transition temperature Tg (P) of the polyester film preferably satisfy the following formula (4).
  • the resin of the X layer is a non-crystalline resin and satisfies the formula (4), that is, when the glass transition temperature Tg (X) of the X layer is equal to or higher than the glass transition temperature Tg (P) of the polyester film + 30°C, it is possible to reduce the occurrence of a phenomenon in which the polyester film melts and loses a metallic tone, that is, a so-called washout phenomenon, for example, in the vicinity of an injection gate of the resin, when injection molding processing is performed.
  • the fluidity of the resin of the X layer is lowered by the crystal portion of the molecular chain, and the washout resistance may be excellent even if the formula (4) is not satisfied.
  • the known method described above can be adopted.
  • the glass transition temperature tends to increase as the volume average molecular weight of the polymer increases and as the molecular weight distribution of the polymer decreases.
  • the glass transition temperature can also be adjusted by introducing various substituents into the monomer skeleton. A specific method of adjusting the glass transition temperature will be described in Examples described later, but is not limited thereto, and can be appropriately selected.
  • the molding film of the present invention preferably has an average reflectance of 30% or more in a wavelength band of 400 nm to 700 nm.
  • the average reflectance is more preferably 50% or more, and further preferably more than 75%.
  • the average reflectance is preferably 80% or more, and more preferably 90% or more.
  • the upper limit of the reflectance is not particularly specified, but is generally 99% in terms of the mechanism of the polyester film exhibiting reflectance by interference reflection.
  • the metallic gloss tone is at a sufficient level.
  • the concealment is sufficiently maintained, so that the visibility of the inside can be suppressed.
  • the average reflectance in the wavelength band of 400 nm to 700 nm can be measured by a method described later.
  • the method of setting the average reflectance in the wavelength band of 400 nm to 700 nm within the above range is not particularly limited, but examples thereof include a method of controlling the layer thicknesses of the A layer and the B layer and the in-plane average refractive indexes of the A layer and the B layer under a condition in which the polyester film has the above-described layer composition. More specifically, a method can be included in which the difference between the in-plane average refractive index of the A layer and the in-plane average refractive index of the B layer is set to 0.005 or more and 0.200 or less, and the number of layers with a layer-pair thickness of 100 nm or more and less than 250 nm is set to 51 or more. By using this method, it is possible to achieve both metallic gloss tone and moldability without using metal.
  • the difference between the in-plane average refractive index of A layer and the in-plane average refractive index of B layer is preferably 0.005 or more and 0.200 or less.
  • the difference between the in-plane average refractive indexes of both layers is 0.005 or more, the appearance of metallic gloss tone can be easily realized.
  • the difference in in-plane refractive index is more preferably 0.050 or more.
  • the difference between the in-plane average refractive indexes of both layers to 0.200 or less, the occurrence of delamination between the layers during molding processing can be reduced.
  • the number of layers with a layer-pair thickness of 100 nm or more and less than 250 nm is preferably 51 or more.
  • the number of layers with a layer-pair thickness of 100 nm or more and less than 250 nm is set to 51 or more, a metallic tone is easily exhibited.
  • the number of layers is preferably 150 or more, and more preferably 350 or more.
  • the thickness of the polyester film constituting the molding film of the present invention is preferably 30 um or more from the viewpoint of imparting a metallic tone to the molding film. From the above viewpoint, the thickness is preferably 60 um or more, and more preferably 80 um or more. On the other hand, the thickness of the polyester film is preferably 500 um or less from the viewpoint of film formability and moldability. From the above viewpoint, the thickness is preferably 300 um or less, and more preferably 150 um or less. Note that the thickness of the polyester film can be reduced by increasing a cast take-over speed, decreasing a discharge amount of molten resin from a spinneret per unit time, reducing a slit width of the spinneret, and the like, and these means can be appropriately combined to be used.
  • the resin of the X layer constituting the molding film of the present invention is preferably a thermoplastic resin.
  • the resin of the X layer is a thermoplastic resin, it may be either crystalline or non-crystalline.
  • the crystalline resin include a polyethylene resin, a polypropylene resin, a polyamide resin/polyethylene terephthalate resin, a polybutylene terephthalate resin, and a polyethylene naphthalate resin.
  • the non-crystalline resin include a polyvinyl chloride resin, a modified polyphenylene ether resin, a polycarbonate resin (hereinafter, it may be referred to as a PC), and an acrylic resin.
  • the resin of the X layer is preferably a non-crystalline resin from the viewpoint of moldability.
  • the resin of the X layer preferably contains, among the non-crystalline resins, at least one of a polycarbonate resin, an acrylic resin, an acrylonitrile butadiene styrene resin, and a polystyrene resin as a main component, particularly from the viewpoint of ease of adjusting the glass transition temperature.
  • the main component refers to a component contained in an amount of more than 50 mass% and 100 mass% or less when a total amount of components constituting the layer is 100 mass%.
  • the content of the polycarbonate resin when a plurality of polycarbonate resins are contained in the layer is calculated by summing all the polycarbonate resins. The same applies to a case where a plurality of acrylic resins, acrylonitrile butadiene styrene resins, or polystyrene resins are contained in the layer.
  • the polycarbonate resin used in the X layer constituting the molding film of the present invention is not particularly limited as long as the effect of the present invention is not impaired, and examples thereof include a polycarbonate resin obtained using 2,2-bis (4-hydroxyphenyl) propane (bisphenol A), a flame-retardant polycarbonate-based resin obtained using a mixture of bisphenol A and 2,2-bis (3,5-dibromo-4-hydroxyphenyl) propane (tetrabromobisphenol A), and a bisphenol A-based polycarbonate-polyorganosiloxane copolymer.
  • bisphenol A 2,2-bis (4-hydroxyphenyl) propane
  • tetrabromobisphenol A 2,2-bis (3,5-dibromo-4-hydroxyphenyl) propane
  • bisphenol A-based polycarbonate-polyorganosiloxane copolymer a bisphenol A-based polycarbonate-polyorganosiloxane copolymer.
  • the acrylic resin to be used in the X layer constituting the molding film of the present invention is not particularly limited as long as the effect of the present invention is not impaired, but for example, a polymer alloy including a polymer mainly composed of a methacrylic acid ester, a copolymer of a methacrylic acid ester and another monomer, and a methacrylic resin and one or more types of other resins is preferable, a polymethyl methacrylate, a polyethyl methacrylate, a polybutyl methacrylate, a polyethylhexyl methacrylate, a polymethyl methacrylate styrene copolymer, a polymethyl methacrylate polyvinylidene fluoride alloy, and the like are preferable, and from the viewpoint of transparency, moldability, and scratch resistance, it is more preferable to use a polymethyl methacrylate.
  • the acrylonitrile butadiene styrene resin used in the X layer constituting the molding film of the present invention is not particularly limited as long as the effect of the present invention is not impaired, but for example, an ⁇ -methylstyrene ABS resin obtained by polymerizing ⁇ -methylstyrene in place of styrene in addition to acrylonitrile, butadiene, and styrene copolymerized, an ABS resin obtained by using phenylmaleimide and adding imide modification, an ASA resin obtained by polymerizing acrylic rubber in place of butadiene, an ACS resin obtained by polymerizing chlorinated polyethylene in place of butadiene, and an AES resin obtained by polymerizing ethylene propylene diene rubber in place of butadiene are preferable.
  • an ⁇ -methylstyrene ABS resin obtained by polymerizing ⁇ -methylstyrene in place of styrene in addition to acrylonitrile, butad
  • the polystyrene resin to be used in the X layer constituting the molding film of the present invention is not particularly limited as long as the effect of the present invention is not impaired, but for example, in addition to those obtained by polymerizing styrene alone, polymers of poly ⁇ -methylstyrene and styrene derivatives substituted at the meta position or the para position, those obtained by copolymerizing the styrene-based monomer, those obtained by copolymerizing various olefin-based resins, and the like are preferable, and a styrene homopolymer resin is more preferable from the viewpoint of transparency and moldability.
  • the polycarbonate-based resin, the acrylic-based resin, the acrylonitrile-butadiene-styrene-based resin, and the polystyrene-based resin may be those to which various additives such as an ultraviolet absorber for imparting weather resistance, rubber particles for imparting flexibility, various dyes and pigments for coloring and light shielding are added.
  • the type of the resin in the X layer is unknown, the type of the resin can be identified by combining known methods such as FT-IR, pyrolysis GC-MS, 1 H-NMR, and 13 C-NMR.
  • the polycarbonate resin, the acrylic resin, the acrylonitrile butadiene styrene resin, or the polystyrene resin is the main component, that is, whether the components are contained in an amount of more than 50 mass% and 100 mass% or less when a total amount of components constituting the layer is 100 mass%, it is possible to separate the components by a known method such as a solvent extraction method or various types of chromatography to determine their contents (mass%).
  • the thickness of the X layer in the molding film of the present invention is preferably 50 um or more and 500 um or less from the viewpoint of processability as a molding film.
  • the thickness of the X layer is 50 um or more, moldability during molding processing is improved.
  • the thickness of the X layer is 500 um or less, processability and workability as a molding film can be secured, and at the same time, an increase in manufacturing cost can be reduced.
  • a preferable range of the thickness of the X layer is 100 um or more and 400 um or less, more preferably 150 um or more and 300 um or less, and still more preferably 200 um or more and 250 um or less.
  • the layer composition of the molding film of the present invention is not particularly limited as long as the molding film has the X layer on at least one surface of the polyester film, but it is preferable that the molding film has the X layers on both surfaces of the polyester film.
  • the molding film is subjected to printing processing, such as a case where it is desired that a part of the molded body is subjected to a metallic tone, instead of the entire surface thereof.
  • the adhesion of the ink can be improved, and warpage generated during heating for the drying of the printing ink can be suppressed.
  • a difference in linear expansion coefficient between the polyester film and the X layer is large, it is particularly effective to provide the X layers on both surfaces.
  • the resins constituting the X layers may be the same type of resin, or different resins may be selected.
  • both the X1 layer and the X2 layer may be layers containing polycarbonate resins as a main component, or the X1 layer may be a layer containing a polycarbonate resin as a main component and the X2 layer may be a layer containing an acrylic resin as a main component.
  • the polycarbonate resins as main components of both layers may be the same or different.
  • the molding film of the present invention preferably has an average transmittance of 70% or more in a wavelength band of 800 nm to 900 nm. It is more preferably 80% or more.
  • the upper limit of the transmittance is not particularly specified, but is generally 95% because light is reflected on the film surface. Since the average transmittance in the wavelength band of 800 nm to 900 nm is 70% or more, deterioration in sensor sensitivity can be reduced when the molded body after molding processing is used as an infrared sensor cover. Note that the average transmittance in the wavelength band of 800 nm to 900 nm can be measured by a method described later.
  • the method of setting the average transmittance in the wavelength band of 800 nm to 900 nm within the above range is not particularly limited, but examples thereof include a method of controlling the layer thicknesses of the A layer and the B layer. More specifically, the number of layers with a layer-pair thickness of 250 nm or more and less than 300 nm is set to 50 layers or less, preferably 45 layers or less. The number of layers is preferably 30 or less, more preferably 10 or less.
  • a molding film 1 an X layer 3 is provided on one surface of a polyester film 2.
  • An adhesive layer 4 may be provided between the polyester film 2 and the X layer 3 ( Fig. 2 ).
  • the X layer 3 may be provided on both surfaces of the polyester film 2 ( Fig. 3 ), or the adhesive layer 4 may be provided between the polyester film 2 on at least one surface and the X layer ( Figs. 4 and 5 ). Since the molding film is subjected to insert molding processing or vacuum pressure molding processing, it is preferable to have X layers on both surfaces of the polyester film from the viewpoint of reducing warpage of the film during printing processing and improving heat resistance during molding processing.
  • the molding film of the present invention preferably has an adhesive layer between the X layer and the polyester film from the viewpoint of enhancing interlayer adhesion.
  • the method for laminating the polyester film and the X layer with the adhesive layer interposed therebetween is not particularly limited, and it is possible to laminate them by a known method, for example, using an optical pressure-sensitive adhesive sheet or a dry lamination method. Among them, the dry lamination method is preferably used from the viewpoint of adhesion during molding.
  • the adhesive to be used in the adhesive layer in the molding film of the present invention is not particularly limited as long as the effect of the present invention is not impaired, but a two-component curable polyurethane-based adhesive is preferably used from the viewpoint of heat resistance during molding processing.
  • the two-component curable polyurethane-based adhesive contains a main agent (polyol) having a hydroxyl group at a polymer terminal and a curing agent (polyisocyanate) having an isocyanate group, and is cured by forming a urethane bond by a reaction between the hydroxyl group and the isocyanate group.
  • Examples of the polyol include a polyether polyol and a polyester polyol.
  • Examples of the polyether polyol include a polyoxyethylene polyol, a polyoxypropylene polyol, a polyoxyethylene-propylene copolymerized polyol, a polytetramethylene polyol, and mixtures thereof.
  • Examples of the polyester polyol include a polyol obtained by polycondensation of a dicarboxylic acid (adipic acid, succinic acid, maleic acid, phthalic acid, and the like) and a glycol (ethylene glycol, propylene glycol, 1,4-butylene glycol, 1,6-hexane glycol, neopentyl glycol, and the like).
  • polyisocyanate examples include aromatic polyisocyanates such as 2,4-tolylene diisocyanate, xylene diisocyanate, 2,6-tolylene diisocyanate, 4,4-diphenylmethane diisocyanate, polymethylene polyphenylene polyisocyanate, carbodiimide-modified MDI, and naphthalene diisocyanate; hexamethylene diisocyanate, isophorone diisocyanate, 4,4-dicyclohexylmethane diisocyanate, and alicyclic polyisocyanate.
  • aromatic polyisocyanates such as 2,4-tolylene diisocyanate, xylene diisocyanate, 2,6-tolylene diisocyanate, 4,4-diphenylmethane diisocyanate, polymethylene polyphenylene polyisocyanate, carbodiimide-modified MDI, and naphthalene diisocyanate
  • additives such as a viscosity modifier, a leveling agent, an anti-gelling agent, an antioxidant, a heat resistant stabilizer, a light resistant stabilizer, a UV absorber, an easily slipping agent, a pigment, a dye, organic or inorganic fine particles, a filler, an antistatic agent, and a nucleating agent, for example, may be blended in the adhesive layer.
  • the thickness of the adhesive layer is preferably 0.5 um or more and 30 um or less from the viewpoint of achieving both adhesiveness and film appearance.
  • the thickness of the adhesive layer of the present invention is 0.5 um or more, adhesion between layers is sufficiently maintained.
  • the thickness of the adhesive layer of the present invention is 30 um or less, thickness unevenness of the layer is suppressed, and deterioration of film appearance is reduced.
  • a preferable range of the thickness of the adhesive layer is more preferably 1 um or more and 20 um or less, still more preferably 3 um or more and 15 um or less.
  • the X layer is in contact with the polyester film without an adhesive layer interposed therebetween.
  • a two-component curable polyurethane-based adhesive is used for the adhesive layer, it is preferable from the viewpoint of enhancing interlayer adhesion, but the molecules have a crosslinked structure causing thermoplasticity to be lost, and the adhesive may not follow the molded state of the polyester film or the X layer depending on the molding shape and conditions. In such a case, it is preferable to select a configuration in which the X layer is in contact with the polyester film.
  • Examples of the method for obtaining the molding film in which the X layer is in contact with the polyester film include a method in which the polyester film and a film for obtaining the X layer are hot-pressed at a temperature equal to or higher than the glass transition temperature of the X layer, and a method in which the X layer is formed by casting a molten resin on the polyester film. It is also preferable that the polyester film is subjected to a corona treatment before hot pressing to improve adhesion.
  • one X layer may have an adhesive layer between itself and the polyester film, and the other X layer may be in contact with the polyester film.
  • the adhesion strength is preferably 1.0 N/10 mm or more from the viewpoint of reducing delamination during molding.
  • the thickness is more preferably 4.0 N/10 mm or more.
  • the upper limit of the adhesion strength is not particularly limited, but is generally 200 N/10 mm or less in terms of the strength of the X layer or the polyester film itself. Examples of the method for setting the adhesion strength to 1.0 N/10 mm or more include a method in which hot pressing is performed at a temperature equal to or higher than the glass transition temperature of the X layer. The adhesion strength can be measured by a method described later.
  • thermoplastic resin A and a thermoplastic resin B are prepared in the form of pellets.
  • the pellets are dried in hot air or under vacuum as necessary, and then fed to two respective extruders.
  • the thermoplastic resin heated and melted to the melting point or higher in each extruder is extruded by equalizing an extrusion amount of the resin with a gear pump or the like, and foreign matters and a modified resin are removed through a filter or the like.
  • the thermoplastic resin A and the thermoplastic resin B fed from different flow paths using two extruders are fed to a multi-layer laminating apparatus.
  • the multi-layer laminating apparatus a multi-manifold die, a feedblock, a static mixer, or the like can be used, but in particular, in order to efficiently obtain the laminate configuration of the polyester film in the present invention, it is desirable to use a feedblock including at least two or more separate members having a large number of fine slits.
  • a feedblock including at least two or more separate members having a large number of fine slits.
  • the apparatus does not become extremely upsized, and therefore, even when there are few foreign matters due to thermal degradation and the number of laminate layers is extremely large, it is possible to perform lamination with high accuracy.
  • the lamination accuracy in the width direction is remarkably improved as compared with conventional techniques, and it is also easy to form an arbitrary layer thickness configuration. Since this apparatus is capable of adjusting the thickness of each layer by the shape (length, width, and gap) of the slit, an arbitrary layer thickness can be easily achieved.
  • the layer thickness of each layer of the polyester film is preferably designed based on the following formula 1.
  • the molten laminated body thus formed into a desired layer composition is discharged into a sheet shape from a slit portion of a die, and the sheet material is extruded onto a rotary cooling body such as a casting drum and cooled and solidified to obtain a casting film (unstretched film).
  • a rotary cooling body such as a casting drum and cooled and solidified to obtain a casting film (unstretched film).
  • the sheet into close contact with the rotary cooling body such as a casting drum by blowing air from a slit-like, spot-like, or planar device, and rapidly cooling and solidifying the sheet, or bringing the sheet into close contact with the rotary cooling body using a nip roll, and rapidly cooling and solidifying the sheet.
  • the rotary cooling body such as a casting drum by blowing air from a slit-like, spot-like, or planar device, and rapidly cooling and solidifying the sheet, or bringing the sheet into close contact with the rotary cooling body using a nip roll, and rapidly cooling and solidifying the sheet.
  • the casting film (unstretched film) thus obtained is preferably biaxially stretched as necessary.
  • the biaxial stretching refers to stretching in the longitudinal direction and the width direction. The stretching may be performed sequentially in two directions or simultaneously in two directions. Further, the casting film may be restretched in the longitudinal direction and/or the width direction.
  • the stretching in the longitudinal direction refers to stretching for imparting molecular orientation to the film in the longitudinal direction, and is usually performed by a circumferential speed difference of the roll.
  • This stretching may be performed in one step by a pair of stretching rolls, or may be performed in multiple steps by using a plurality of stretching roll pairs.
  • the stretch ratio varies depending on the type of the resin, it is usually preferably 2 to 15 times, and when polyethylene terephthalate is used in any of the thermoplastic resins that constitute the polyester film, the ratio is particularly preferably 2 to 7 times.
  • the stretching temperature is preferably from the glass transition temperature of the resin having a higher glass transition temperature among the resins A and B constituting the polyester film to the glass transition temperature + 100°C.
  • the polyester film may be provided with an adhesion layer.
  • a method of providing the adhesion layer a method of coating and laminating a coating agent is preferable.
  • the method for coating the coating agent include a method in which coating is performed in a step different from the step of producing the polyester film in the present invention, a so-called off-line coating method, and a so-called in-line coating method in which coating is performed during the step of producing the polyester film in the present invention to laminate the adhesion layer at a time.
  • a solvent for the coating liquid used in this case is preferably aqueous from the viewpoint of environmental pollution and explosion resistance, and it is the most preferable mode to use water.
  • a coating agent constituting the adhesion layer When the adhesion layer is laminated by in-line coating, it is preferable to continuously apply a coating agent constituting the adhesion layer to a uniaxially stretched polyester film.
  • a coating agent aqueous coating agent
  • a reverse coating method for example, a reverse coating method, a spray coating method, a bar coating method, a gravure coating method, a rod coating method, a die coating method, or the like can be used.
  • a crosslinking agent an antioxidant, a heat stabilizer, a weather-resistant stabilizer, an ultraviolet absorber, an organic lubricant, a pigment, a dye, organic or inorganic particles, a filler, a surfactant, and the like may be blended in the adhesion layer.
  • the subsequently performed stretching in the width direction refers to stretching for imparting molecular orientation in the width direction to the film
  • the film is usually conveyed using a tenter with both ends of the film being held with clips, heated and preheated, and then stretched in the width direction.
  • the aqueous coating agent applied immediately before the tenter is dried at the time of preheating.
  • the stretch ratio varies depending on the type of the resin, it is usually preferably 2 to 15 times, and when polyethylene terephthalate is used in any of the thermoplastic resin A or the thermoplastic resin B, the stretch ratio is particularly preferably 2 to 7 times.
  • the stretching temperature is preferably from the glass transition temperature of the resin having a higher glass transition temperature among the thermoplastic resins A and B constituting the polyester film in the present invention to the glass transition temperature + 120°C.
  • the biaxially stretched polyester film is preferably subjected to a heat treatment at a temperature equal to or higher than the stretching temperature and equal to or lower than the melting point in the tenter in order to impart flatness and dimensional stability. After being heat-treated in this manner, the film is gradually cooled down uniformly, cooled to room temperature, and wound up by a winder.
  • a relaxation treatment or the like may be combined as necessary during the gradual cooling from the heat treatment.
  • a coating agent for forming an adhesion layer is continuously applied to the obtained cast film.
  • a coating agent aqueous coating agent
  • a reverse coating method for example, a reverse coating method, a spray coating method, a bar coating method, a gravure coating method, a rod coating method, a die coating method, or the like can be suitably used.
  • the surface of the polyester film in the present invention is also preferable to subject the surface of the polyester film in the present invention to a corona discharge treatment or the like before applying the aqueous coating material. This is because the adhesiveness between the polyester film and the coating agent is improved, and the coatability is also improved. Then, the cast film coated with the coating agent is led to a simultaneous biaxial tenter, conveyed with both ends of the film being held with clips, and stretched in the longitudinal direction and the width direction simultaneously and/or step by step.
  • Examples of a simultaneous biaxial stretching machine include those of a pantograph type, a screw type, a drive motor type, and a linear motor type, but a simultaneous biaxial stretching machine of a drive motor type or a linear motor type is preferable because the machine is capable of changing the stretch ratio arbitrarily and capable of performing the relaxation treatment at any place.
  • the stretch ratio varies depending on the type of resin, but the area ratio is usually preferably 6 to 50 times, and particularly preferably 8 to 30 times.
  • the stretching temperature is preferably from the glass transition temperature of the resin having a higher glass transition temperature among the thermoplastic resins A and B to the glass transition temperature + 120°C.
  • the film biaxially stretched is preferably subsequently subjected to a heat treatment for imparting planarity and dimensional stability in the tenter at a temperature equal to or higher than the stretching temperature and equal to or lower than the melting point.
  • a heat treatment it is preferable to perform a relaxation treatment in the longitudinal direction instantaneously immediately before and/or immediately after the film enters the heat treatment zone in order to reduce the distribution of the main orientation axis in the width direction.
  • the film After being heat-treated in this manner, the film is gradually cooled down uniformly, cooled to room temperature, and wound up by a winder.
  • a relaxation treatment in the longitudinal direction and/or the width direction may be performed as necessary during the gradual cooling from the heat treatment.
  • the relaxation treatment in the longitudinal direction instantaneously immediately before and/or immediately after the film enters the heat treatment zone.
  • the film After being heat-treated in this manner, the film is gradually cooled down uniformly, cooled to room temperature, and the polyester film is wound up by a winder.
  • a coating material of an adhesive is applied to the polyester film obtained as described above.
  • an appropriate coating method may be selected, depending on the viscosity and coating amount of the adhesive coating material, from coating methods such as a gravure coater, a gravure reverse coater, a lip coater, a flexo coater, a blanket coater, a roll coater, a knife coater, an air knife coater, a kiss touch coater, a kiss touch reverse coater, a comma coater, a comma revere coater, and a micro reverse coater, but when a two-component curable polyurethane-based adhesive is used, a gravure coater is preferably used.
  • the solvent component of the adhesive is then passed through a drying oven to be dried.
  • the drying temperature is selected depending on the type of the adhesive resin, the type of the solvent, the heat resistance of the polyester film, and the like, and is preferably 40°C to 120°C.
  • the multilayer film thus obtained is wound on a sheet winding core, and for the purpose of curing the two-component curable polyurethane-based adhesive, heat treatment is performed at 20 to 60°C for 24 to 168 hours while the obtained multilayer film is wound on a roll.
  • the temperature of the heat treatment is less than 20°C and/or the time of the heat treatment is less than 24 hours, the curing of the adhesive does not sufficiently proceed, sufficient adhesive strength is not obtained, and a deviation may occur in the film bonded in the subsequent step.
  • the temperature exceeds 60°C and/or the time of the heat treatment exceeds 168 hours, winding interference marks significantly appear on the rolled sheet, and a streak-like appearance defect may occur.
  • the molding film of the present invention having the X layer on one surface can be obtained in this manner.
  • the X layer may be further formed on the polyester film side of the molding film of the present invention having the X layer on one surface by the same method.
  • Two or more polyester films produced as described above may be used to form the molding film of the present invention.
  • the method for laminating a plurality of polyester films is not particularly limited, and lamination can be performed using the same method as the method for laminating the polyester film and the X layer described above.
  • the molding film of the present invention has a metallic gloss tone, and is excellent in moldability during molding processing and electromagnetic wave transparency of a molded body, and thus can be suitably used as a molded body.
  • the molded body of the present invention includes the molding film of the present invention.
  • the method for forming the molded body is not particularly limited as long as the effect of the present invention is not impaired, and for example, a molding processing method such as insert molding or vacuum pressure molding can be used.
  • the resin used in the insert molding is not particularly limited as long as the effect of the present invention is not impaired, and for example, resins such as a polybutadiene-based resin, a polystyrene-based resin, a polypropylene-based resin, an acryl-based resin, a polyacrylonitrile-styrene-based copolymer resin, a polyacrylonitrile-butadiene-styrene-based copolymer resin, a polycarbonate-based resin, and a polyacrylonitrile-ethylene-propylene-styrene-based copolymer resin are used.
  • various additives may be added as long as the effect of the present invention is not impaired. Examples of the additives preferably used include UV absorbers and pigments intended for coloring.
  • the molded base material used in the vacuum and pressure molding is not particularly limited as long as the effect of the present invention is not impaired, and for example, resins such as a polybutadiene-based resin, a polystyrene-based resin, a polypropylene-based resin, an acryl-based resin, a polyacrylonitrile-styrene-based copolymer resin, a polyacrylonitrile-butadiene-styrene-based copolymer resin, a polycarbonate-based resin, and a polyacrylonitrile-ethylene-propylene-styrene-based copolymer resin, metals such as aluminum and magnesium, glass, carbon fiber molded products, and the like are used.
  • resins such as a polybutadiene-based resin, a polystyrene-based resin, a polypropylene-based resin, an acryl-based resin, a polyacrylonitrile-styrene-based copolymer resin, a polyacryl
  • a partial coloring layer may be provided on the molding film by a known method before the insert molding or vacuum pressure molding.
  • a cross section parallel to the thickness direction was cut out from a sample of the molding film using a microtome. Then, using a transmission electron microscope (TEM) H-7100 FA type manufactured by Hitachi, Ltd., the cross section of the polyester film section was observed at a magnification of 40,000 times at an accelerating voltage of 75 kV, and the layer composition and the layer thickness were measured by photographing the cross section. Note that in order to obtain high contrast, the samples were stained using RuO 4 .
  • TEM transmission electron microscope
  • a cross-sectional photograph taken with a TEM at a magnification of about 40,000 times was captured with an image size of 729 dpi using CanonScanD123U (manufactured by Canon Inc.).
  • the image was stored in JPEG format, and then the JPEG file was opened using image processing software Image-Pro Plus ver. 4 (available from Planetron Co., Ltd.) to perform image analysis.
  • image analysis processing the relationship of the average brightness in the region sandwiched between two lines in the thickness direction and the width direction in the vertical thick profile mode was read as numerical data.
  • the average value of the sum of the layer thicknesses of the adjacent A layer and B layer was sequentially determined for all sets, and the number of layers with a layer-pair thickness of 250 nm or more and less than 300 nm and the number of layers with a layer-pair thickness of 100 nm or more and less than 250 nm were counted.
  • the adhesive layer was peeled off from the molding film, and the adhesive layer was removed with a solvent or cut with a knife to obtain an X layer and a polyester film.
  • the polyester film or the X layer used for the molding film was able to be prepared as a single film, the polyester film or the X layer was used (the same applies to the subsequent measurement and evaluation).
  • the obtained sample was cut into a size of 10 mm (width direction) ⁇ 150 mm (longitudinal direction), and set in a universal testing instrument "Tensilon" (registered trademark) UCT-100 manufactured by ORIENTEC CORPORATION so as to have an initial test length of 100 mm.
  • a tensile test was performed at 150°C to determine a 50% tensile stress (a stress when the distance between clips was extended to 150 mm). Five samples were measured, and the average value thereof was defined as the 50% tensile stress of the polyester film.
  • An X layer and a polyester film were obtained from the molding film by the method described in (3). About 5 mg of each was weighed, and sandwiched between aluminum pans, and the temperature was raised from 25°C to 300°C at 20°C/min using DSCvesta Smart Loader manufactured by Rigaku Corporation, and measurement was performed. The glass transition temperature (Tg) was determined from the obtained DSC data. Note that when the glass transition temperature of each of the thermoplastic resin A and the thermoplastic resin B was determined from the DSC curve measured by the above method with respect to the glass transition temperature of the polyester film, the higher side temperature was defined as the glass transition temperature (Tg (P)) of the polyester film.
  • the temperature was defined as the glass transition temperature (Tg (P)) of the polyester film.
  • a 5-cm square sample was cut out from the center of the molding film.
  • the relative reflectance at an incident angle ⁇ of 10 degrees was measured using a spectrophotometer U-4100 manufactured by Hitachi, Ltd.
  • the inner wall of the attached integrating sphere is barium sulfate, and the standard plate is aluminum oxide.
  • the measurement was performed at a measurement wavelength of 250 nm to 1200 nm, a slit of 2 nm (visible)/automatic control (infrared), a gain of 2, and a scanning speed of 600 nm/min.
  • the backside of the sample was painted black with an oil-based ink. Next, the average reflectance in the wavelength band of 400 to 700 nm was calculated.
  • the average reflectance was obtained by calculating the area surrounded by the reflection curve and the wavelength band based on Simpson's formula using the data of the absolute reflectance for each wavelength of 1 nm and dividing the area by 300 nm, which is the width of the wavelength band.
  • Simpson's rule is described in " Numerical Computation Method for Electronic Calculators I" (Baifukan) (1965) written by Jiro Yamauchi et al.
  • a 5-cm square sample was cut out from the molding film.
  • the transmittance at an incident angle ⁇ of 0 degrees was measured using a spectrophotometer U-4100 manufactured by Hitachi, Ltd.
  • the inner wall of the attached integrating sphere is barium sulfate.
  • the measurement was performed at a measurement wavelength of 250 nm to 1200 nm, a slit of 2 nm (visible)/automatic control (infrared), a gain of 2, and a scanning speed of 600 nm/min.
  • the average transmittance in the wavelength band of 800 to 900 nm was calculated.
  • the area surrounded by the reflection curve and the wavelength band was calculated based on Simpson's formula using the data of the absolute reflectance for each wavelength of 1 nm and dividing the area by 100 nm, which is the width of the wavelength band to obtain the average transmittance.
  • the molding film was sampled to a size of 10 mm ⁇ 200 mm.
  • the interface between the X layer and the polyester film was separated using a cutter knife in a region of approximately 10 mm ⁇ 10 mm at the end of the sample.
  • the sample was subjected to a peeling test using Autograph AG-IS manufactured by Shimadzu Corporation under the conditions of a peeling angle of 90 ° and a peeling rate of 200 mm/min.
  • the average value of the results of three peeling tests was defined as the adhesion strength.
  • an acrylic/urethane-based black ink was applied to the surface of a molding film cut out into a size of 200 mm ⁇ 300 mm so that the coating thickness after drying was 20 um, and drying was performed for 10 minutes in a hot air oven set at 80°C.
  • the warpage of the film immediately before being taken out of the oven 10 minutes after being put into the drying step was evaluated according to the following criteria, and A and B were regarded as being acceptable.
  • the molding film sample prepared as described in (9) was set in an injection molding machine manufactured by The Japan Steel Works, Ltd., the mold temperature of which was set to 60°C, and injection molding with a polycarbonate resin heated to 230°C was performed to obtain a molded body.
  • the moldability of a decorative molding film was evaluated according to the following criteria based on the state in which the obtained molded body was molded along a mold (contraction ratio: molding height/bottom surface diameter), and A and B were regarded as being acceptable.
  • the degree of reduction in metallic tone (due to melting of the polyester film) of the black ink coated printing portion of the sample for moldability evaluation in (10) was visually confirmed in a place other than that, and evaluation was performed according to the following criteria, and a sample having an evaluation of A, B, or C was regarded as being acceptable.
  • Samples for moldability evaluation in (10) were visually evaluated according to the following criteria from the surface provided with the checkered pattern coloring layer, and a sample having an evaluation of A, B, or C was regarded as being acceptable.
  • the coloring of a portion, not coated with the black ink, of the sample for moldability evaluation in (10) was visually evaluated according to the following criteria, and a sample having an evaluation of A, B, or C was regarded as being acceptable. Note that those having molding followability of C rank were excluded from the evaluation target.
  • the unevenness of the metallic tone of a portion, not coated with the black ink, of the sample for moldability evaluation in (10) was visually evaluated according to the following criteria, and a sample having an evaluation of A or B was regarded as being acceptable. Note that those having molding followability of C rank were excluded from the evaluation target.
  • the resin used for the A layer was brought into a molten state at 290°C by a biaxial extruder with a vent, guided to a T-die via a gear pump and a filter, and molded into a sheet, and then brought into close contact with a casting drum maintained at a surface temperature of 25°C by electrostatic application, and rapidly cooled and solidified to obtain a cast film having a thickness of 100 ⁇ m.
  • Sampling was performed from the center in the width direction of the obtained film, and the refractive indexes in the flow direction and the width direction of the film were measured using an Abbe refractometer NAR 4T manufactured by ATAGO CO., LTD.
  • thermoplastic resin for obtaining the polyester film used for the molding film for example, the following resins were used.
  • 0.09 parts by weight of magnesium acetate and 0.03 parts by weight of antimony trioxide based on the amount of dimethyl terephthalate were added to a mixture of 100 parts by weight of dimethyl terephthalate and 60 parts by weight of ethylene glycol, and the mixture was heated to increase temperature by a conventional method to perform transesterification reaction. Subsequently, 0.020 parts by weight of an 85% aqueous phosphoric acid solution based on the amount of dimethyl terephthalate was added to the transesterification reaction product, and then the reaction product was transferred to a polycondensation reaction tank.
  • the reaction system was gradually depressurized while performing heating to increase temperature, and a polycondensation reaction was performed at 290°C under a reduced pressure of 1 mmHg by a conventional method to obtain polyethylene terephthalate (hereinafter, it may be referred to as PET) having an intrinsic viscosity (IV) of 0.63.
  • PET polyethylene terephthalate
  • IV intrinsic viscosity
  • thermoplastic resin A-2 Polymerization was performed in the same manner as for the thermoplastic resin A-1, except that a mixture of 100 parts by weight of dimethyl 2,6-naphthalenedicarboxylate and 60 parts by weight of ethylene glycol was used, to obtain a polyethylene naphthalate (hereinafter, it may be referred to as PEN) resin having an intrinsic viscosity (IV) of 0.67. This was defined as a thermoplastic resin A-2.
  • PEN polyethylene naphthalate
  • IV intrinsic viscosity
  • thermoplastic resin A-3 Polymerization was performed in the same manner as for the thermoplastic resin A-1, except that a mixture of 50 parts by weight of dimethyl terephthalate, 100 parts by weight of dimethyl 2,6-naphthalenedicarboxylate, and 60 parts by weight of ethylene glycol was used, to obtain a copolymerized polyester resin having an intrinsic viscosity (IV) of 0.65. This was defined as a thermoplastic resin A-3.
  • a copolymerized polyester resin having an intrinsic viscosity (IV) of 0.55 obtained by copolymerizing 21 mol% of spiroglycol (SPG) and 24 mol% of cyclohexanedicarboxylic acid (CHDC) was defined as a thermoplastic resin B-1.
  • a copolymerized polyester resin having an intrinsic viscosity (IV) of 0.72 obtained by copolymerizing 30 mol% of cyclohexanedimethanol (CHDM) was defined as a thermoplastic resin B-2.
  • thermoplastic resin B-3 A copolymerized polyester resin mixture obtained by mixing the thermoplastic resin A-1 and the thermoplastic resin B-2 at a ratio of 65 : 35 (mass ratio) was defined as a thermoplastic resin B-3.
  • thermoplastic resin B-4 A copolymerized polyester resin mixture obtained by mixing the thermoplastic resin A-1 and the thermoplastic resin B-2 at a ratio of 70 : 30 (mass ratio) was defined as a thermoplastic resin B-4.
  • thermoplastic resin B-5 A copolymerized polyester resin mixture obtained by mixing the thermoplastic resin A-1 and the thermoplastic resin B-2 at a ratio of 75 : 25 (mass ratio) was defined as a thermoplastic resin B-5.
  • Limirror (registered trademark) U48 manufactured by Toray Industries, Inc. with a film thickness of 125 um or 250 ⁇ m was used.
  • An ABS film manufactured by TOWA KAKO CO., LTD., having a film thickness of 100 um was used.
  • a polycarbonate resin (weight average molecular weight: 8000) polymerized by a phosgene method was brought into a molten state at 280°C by a biaxial extruder, then guided to a T-die via a gear pump and a filter to be molded into a sheet, and then brought into close contact with a casting drum maintained at a surface temperature of 25°C to be rapidly cooled and solidified to obtain a cast film, and the cast film was wound up by a winder.
  • Two kinds of film samples having thicknesses of 125 um and 250 um were obtained by adjusting the deposition rate.
  • Two kinds of film samples having thicknesses of 125 ⁇ m and 250 um were obtained in the same manner as in (Film C-5) except that a polycarbonate resin (weight average molecular weight: 40,000) polymerized by a phosgene method was used.
  • Two kinds of film samples having thicknesses of 125 ⁇ m and 250 um were obtained in the same manner as in (Film C-5) except that a polycarbonate resin (weight average molecular weight: 40,000) polymerized by a transesterification method was used.
  • a polycarbonate resin weight average molecular weight: 40,000
  • Two kinds of film samples having thicknesses of 125 ⁇ m and 250 um were obtained in the same manner as in (Film C-5) except that a polycarbonate resin (weight average molecular weight: 40,000) polymerized by a phosgene method using 1,1-Bis (4-hydroxyphenyl) cyclohexane was used instead of bisphenol A.
  • a polycarbonate resin weight average molecular weight: 40,000
  • thermoplastic resin A-1 and the thermoplastic resin B-5 were each brought into a molten state at 290°C by a separate biaxial extruder with a vent, and then joined by a 901-layer feedblock having 4 separate members each having 225 slits via a gear pump and a filter.
  • the outermost layers on both sides to be the thick film layer were made of the thermoplastic resin A, the thermoplastic resin A and the thermoplastic resin B were alternately laminated, and the layer thickness of the layer made of the thermoplastic resin A and the layer thickness of the layer made of the thermoplastic resin B adjacent to each other were made substantially the same.
  • the resin was guided to a T-die and molded into a sheet, and then brought into close contact with a casting drum maintained at a surface temperature of 25°C by electrostatic application to be rapidly cooled and solidified, thereby obtaining a cast film.
  • the obtained cast film was heated with a group of rolls set at 75°C, and then stretched 3.3 times in the vertical direction (longitudinal direction) while rapidly heated from both sides of the film with a radiation heater in a stretching section of 100 mm in length, and then cooled once to obtain a uniaxially stretched film.
  • the obtained uniaxially stretched film was guided to a tenter, preheated with hot air at 100°C, and then stretched 3.5 times in the transverse direction at a temperature of 110 to 150°C.
  • the biaxially stretched film was directly subjected to a heat treatment with hot air at 240°C in the tenter, then subjected to a 7% relaxation treatment in the width direction at the same temperature, then cooled to room temperature, and wound up with a winder.
  • a two-component polyurethane-based thermosetting adhesive dry laminate adhesive BLS-PC21 manufactured by Toyo Ink Co., Ltd.
  • dry laminate adhesive BLS-PC21 manufactured by Toyo Ink Co., Ltd.
  • the polyester-based resin film (film C-1) having a thickness of 250 um was bonded using nip rolls at a nip pressure of 0.4 MPa and a temperature of 40°C to form an X layer (X1 layer), thereby obtaining a desired molding film.
  • Table 1 The evaluation results of the obtained polyester film, molding film, and molded body using them are shown in Table 1.
  • thermoplastic resin A the thermoplastic resin B, and the film for forming the X1 layer were as shown in Table 1.
  • the results of evaluation are shown in Table 1.
  • a PC-based resin film (film C-5) having a thickness of 125 ⁇ m was bonded to the other surface of the polyester film of the molding film obtained in Example 9 in the same manner to form an X layer (X2 layer), thereby obtaining a molding film.
  • the results of evaluation are shown in Table 1.
  • a molding film was obtained in the same manner as in Example 10 except that the thicknesses of the thermoplastic resin A, the thermoplastic resin B, the film for forming the X1 layer and the X2 layer, and the polyester film were as shown in Tables 1 and 2. The results of evaluation are shown in Tables 1 and 2. The thickness of the polyester film was adjusted by changing the deposition rate.
  • a polyester film was obtained in the same manner as in Example 15. Then, a polyester film and a PC-based resin film (film C-5) having a thickness of 250 um were passed at a line speed of 5 m/min while a pressure of 10 MPa was applied to two opposing metal rolls (a diameter of 180 mm ⁇ ) set at a temperature of 120°C to form an X layer (X1 layer), thereby obtaining a molding film.
  • the results of evaluation are shown in Table 2.
  • a polyester film was obtained in the same manner as in Example 16 except that an adhesion layer was provided.
  • the adhesion layer was provided as follows.
  • the following adhesion coating material was applied onto a uniaxially stretched film by a bar coating method so that the application amount on the film after stretching and drying in the width direction was 0.2 g/m 2 .
  • a polyester film was obtained in the same manner as in Example 17 except that the thermoplastic resin A-1 was used instead of the thermoplastic resin A-2 at the time of producing the polyester film. Thereafter, in the same manner as in Example 16, two obtained polyester films were laminated by hot pressing, a PC-based resin film (film C-5) having a thickness of 125 um was then laminated by hot pressing, and a PC-based resin film (film C-5) having a thickness of 125 um was then laminated on the opposite surface to obtain a molding film. The results of evaluation are shown in Table 2.
  • a molding film was obtained in the same manner as in Example 18 except that the films for forming the X1 layer and the X2 layer were as shown in Table 2. The results of evaluation are shown in Table 2.
  • a molding film was obtained in the same manner as in Example 21 except that the polyester film was as shown in Table 2. Note that the configuration of the feedblock was changed, and a polyester film was prepared so that the number of laminate layers and the layer-pair thickness of the A layer and the B layer described in Table 2 were obtained. The deposition rate was adjusted so that the thickness of the polyester film was as shown in Table 2. The results of evaluation are shown in Table 2.
  • Example 1 The polyester film obtained in Example 1 was used as it was with no X layer formed thereon. The results of evaluation are shown in Table 1.
  • Example 14 The polyester film obtained in Example 14 was used as it was with no X layer formed thereon. The results of evaluation are shown in Table 1.
  • An indium vapor deposition layer having a thickness of 50 nm was formed on one surface of "Lumirror” (registered trademark) U48 (film thickness: 125 um) manufactured by Toray Industries, Inc. using a vacuum vapor deposition machine.
  • An acrylic resin film (film C-2) was formed on the indium-deposited surface, and a PC-based resin film (film C-5) was formed on the opposite surface in the same manner as in Example 15 to form an X1 layer and an X2 layer, thereby obtaining a molding film.
  • the results of evaluation are shown in Table 1.
  • Each of the polyester films of Examples and Comparative Examples 1 and 2 includes three or more thick film layers in which the number of layers with a layer thickness of 100 nm or more and less than 200 nm is larger than the number of layers with a layer-pair thickness of 200 nm or more and less than 250 nm and the thickness is 1 ⁇ m or more and 20 um or less.
  • the layer composition has been realized by adjusting the configuration of the feedblock by the method described in Japanese Patent Laid-open Publication No. 2007-176154 .
  • a molding film having excellent moldability during molding processing can be provided.

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EP22759619.4A 2021-02-24 2022-02-22 Molding film and molded body in which same is used Pending EP4299313A1 (en)

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KR20210055684A (ko) * 2018-09-12 2021-05-17 도레이 카부시키가이샤 적층 필름
CN111531998A (zh) * 2020-04-30 2020-08-14 王洛 一种光学聚酯薄膜
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